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CHAPTER 4: User-Interface Tools Types of controls 70

Checkbox

Allows the user to set a boolean state.

X Set the text property to assign an identifying text string that appears next to the

clickable box.

X The user can click to select or deselect the box, which shows a checkmark when

selected. The

value is true when it is selected (checked) and false when it is not.

When you create a

Checkbox, you can set its value property to specify its initial state

and appearance.

// Add a checkbox to control the buttons that dismiss an alert box

dlg.hasBtnsCb = dlg.add(‘checkbox’, undefined,

‘Should there be alert buttons?’);

dlg.hasBtnsCb.value = true;

RadioButton

Allows the user to select one choice among several.

X Set the text property to assign an identifying text string that appears next to the

clickable button.

X The value is true when the button is selected. The button shows the state in a

platform-specific manner, with a filled or empty dot, for example.

You group a related set of radio buttons by creating all the related elements one after

another. When any button’s value becomes true, the value of all other buttons in the

group becomes false. When you create a group of radio buttons, you should set the

state of one of them true:

var dlg = new Window(‘dialog’, ‘Alert Box Builder’);

dlg.alertBtnsPnl = dlg.add(‘panel’, undefined, ‘Button alignment’);

dlg.alertBtnsPnl.alignLeftRb = dlg.alertBtnsPnl.add(‘radiobutton’,

undefined, ‘Left’);

dlg.alertBtnsPnl.alignCenterRb = dlg.alertBtnsPnl.add(‘radiobutton’,

undefined, ‘Center’);

dlg.alertBtnsPnl.alignRightRb = dlg.alertBtnsPnl.add(‘radiobutton’,

undefined, ‘Right’);

dlg.alertBtnsPnl.alignCenterRb.value = true;

dlg.show();

Progressbar

Typically used to display the progress of a time-consuming operation. A colored bar

covers a percentage of the area of the control, representing the percentage

completion of the operation. The

value property reflects and controls how much of

the visible area is colored, relative to the maximum value (

maxvalue). By default the

range is 0 to 100, so the

value=50 when the operation is half done.

Slider

Typically used to select within a range of values. The slider is a horizontal bar with a

draggable indicator, and you can click a point on the slider bar to jump the indicator

to that location. The

value property reflects and controls the position of the indicator,

within the range determined by

minvalue and maxvalue. By default the range is 0 to

100, so setting

value=50 moves the indicator to the middle of the bar.

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